Encased transformer



E. D. EBY ENCASED TRANSF RMER Filed May 8, 1923 [rive/7602': Eugene 056% y MSAttomey Patented May 12, 1925'.

UNITED STATES EUGENE n. EBY, or

1,537,756 PATENT OFFICE.

PITTSFIELD, MASSACHUSETTS, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION E NEW YORK.

ENCASED TRANSFORMER.

Application filed May 8, 1923. Serial No. 637,562.

To all whom it may concern;

Be it known that I, EUGENE D. Ear, a citizen of the United States, residin at Pittsfield, in the county of Berkshire, tate 6 of Massachusetts, have invented certain new .and'iiseful Improvements 1n Encased Transformers, of which the following is a specification.

My lIIVElllZlOll relates to encased trans- 10 formers. The general object of the invention is to provide an improved arrangement and construction resultmg in compactness, minimum welght and reduced cost as compared with present practice. The

High tension transformers are commonly.

80 immersed in an insulatin liquid within a metal casing provided wit insulating bushings for the transformer leads extending through the cover of the casing, in order to provide suitable distance to prevent arc- :6 ing between the transformer wmdings and,

leads and the metal cover and upper portion of the wall of the casing. This necessitates a relatively tall casing in order that its cover may be spaced a considerable distanceabove the transformer windings-and in order that there may be sufiicient space available under the cover for the lower ends of thebushings; In accordance with the invention, the upper portion of the transa former casing has the 'generaL form of the usual high tension insulating bushing 'but made large enough to surround theupper portionof the transformer and provided with means at an opening at its top for 40 supporting the high tension leads ofthe transformer. Among the advantages of this construction are minimum helght and weight with a consequent low cost and convenlence in handling. A further advantage is the avoidance of the necessity for se arate high tension bushings for the high tension transformer leads.

Further objects and advantages will be apparent from the following description so taken in connection with the accompanying drawing in which Figure 1 is a view, largely in vertical section, of an encased oil immersed current or instrument transformer arranged in accordance with the invention,

8 and Fig. 2 is a sectional view on the line ing 2 and a low tension windin permits the insulating portion 5 of the eas- 2-2 of Fig. 1 of the upper part of the encased transformer.

Like reference characters refer to similar parts in both figures of the drawing.

The particular embodiment of the invention shown in the drawing includes a high tension current or instrument transformer having a core 1 with a high tension wind- 3. The transformer is immersed in an lnsulatin liquid within a casing comprising a meta base portion 4 and an upper portion 5 of moulded insulating material'such as pores-- lain. The core 1 is disposed horizontally and supported by a plate 7 secured in the joint between the two portions 4 and 5 of the casing so that the transformer core and windings are supported by the upper rimof the lower portion 4 of the casing. The core 1 has three legs, the center one being surrounded by the windings 2 and 3. The high tension winding is insulated from the .low tension winding and core b high tension bushings 6 extending suitab e distances above and below the core. The high tension winding 2 and its bushings extend considerable distances above and below the core 1 and the low tension winding 3 in order that the parts of the high tension winding exposed between theends of the bushings may be sufliciently spaced from all other parts which operate at lower potential. The leads from the high tension win are carried out through a cover which is 1n the form of an outlet member provided with outlet bushings 9-and a hand hole cover 10. The transformer is immersed in. suitable insulating liquid which fills the main casing and extends up into'a compartment 11 in the lower part of the outlet member 8 where the level of the liquid may arise and fall to accommodate expansion and contraction due to varying temperature conditions. The construction which has been described ing to be tapered toward its upper end.

This is of advantage in reducing considerabl the size and weight of the casin an also the amount of insulating liquid necessary for proper immersion of the transformer.

What I claim as new and desire to secure by Letters Patent of the Unital States, 1s

1. The combination with a high tension 1x0 transformer of a casing therefor, the wall of said casing comprising a lower metallic section and an upper insulating section, the transformer comprising a horizontally disposed core supported by said lower metallic wall section near its upper edge, high tension bushings extending from the space within said lower metallic wall section through said core into the space within said upper insulating wall section, the transformer having a high tension winding extending through said bushings, and an outlet cover at the upper end. of said casing wall.

2. The combination with a high tension transformer of a casing therefor, the wall said wall sections whereby said transformer is supported by the u per edge of said lower wall section, sai transformer having a high tension winding extending downwardly into the space within said lower wall section and upwardly into the space within said upper insulating wall section. and an outlet cover at the upper end of said casing wall.

In witness whereof, I have hereunto set my hand this 2nd'day of May, 1923.

EUGENE D. EBY. 

